Computer Science
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.270..341b&link_type=abstract
In ESA, Proceedings of the 8th ESA Symposium on European Rocket and Balloon Programs and Related Research p 341-345 (SEE N88-162
Computer Science
7
Magnetohydrodynamic Flow, Rocket-Borne Instruments, Sunspots, Ultraviolet Spectra, Flow Velocity, Image Processing, Temperature Effects, Ultraviolet Spectroscopy
Scientific paper
Downflows in the transition zone above a sunspot were observed with a high resolution telescope and spectrograph on a rocket. The rocket spectra on photographic film were digitized. Noise caused by film grains was removed by Fourier filtering. The spectral images were corrected for geometrical distortions and calibrated to give the solar intensity as a function of wavelength. Maximum speeds of 200 km/sec are reached in the flows which extend over 60 arc-sec along the slit. Components with distinct, but lower velocities also appear. The variations with temperature of the characteristic flow speeds are studied.
Bartoe John-David F.
Brekke Paal
Brueckner Guenter E.
Kjeldseth-Moe Olav
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